1 Kings 14:21

Forty one years — Therefore he was born a year before Solomon was king, as appears from 1 Kings 11:42, this is noted as an aggravation of Rehoboam's folly, that he was old enough to have been wiser. An Ammonitess — A people cursed by God, and shut out of the congregation of his people for ever. This is observed as one cause both of God's displeasure in punishing Solomon with such a son, and of Rehoboam's apostacy after his three first years, 2 Chronicles 11:17. None can imagine how fatal and how lasting are the consequence of being unequally yoked with an unbeliever.